One of the reasons that I'm buying a new car is that I have plans for many cross country road trips; self-driving or driving assistant is certainly helpful.
Yeah, so go ahead and remove ”self-driving” from your vocabulary

— it’s at best Level-2 autonomy, which is essentially ACC+Stop/Go…with some other “features” There really isn’t much tangible difference between my 2019 X5 and my 2019 Tesla P3D w/ FSD license. The X5 doesn’t have as many issues with phantom braking and general adaptive cruise wonkiness compared to my Tesla. The Tesla seemed to get less smooth recently…possibly because they’re moving to a vision-only system…and it probably needs a new eyeglass prescription.

They both will do auto-change lane on signal…Tesla will more easily navigate freeway interchanges…it still gets pretty confused with merge lanes or if you’re traveling in the R lane, at on/off ramps the wide lane freaks it out.…. Aside from that, for highway (i.e. interstate) driving, both systems work pretty well to ease the stress a bit.
Note — Tesla is nearing launch of an updated FSD software stack… so that should make things interesting, but either way, full autonomy is a few decades away from reality...
All that aside, one concern I have with the i4 (i.e. non-Tesla EVs) is the L3 charging infrastructure. If you’re planning to use the car for long distance road trips, you need to make sure you’ll be comfortable with the number of EV chargers and where they’re at…it’s not like today with a petrol station on every corner. Tesla has spent a boat load building out their network…. here in the southeast, I noted the increase in locations on my latest trip between FL and VA… I always had a little range anxiety between Jax and Columbia SC…. Not anymore… there are three more Supercharger locations along 95 in GA/SC that filled a big gap in coverage... I can’t say the same for EVgo, Blink and ElectrifyAmerica. …that will be a concern again if I want to take either an i4 or an iX on the same route.
Anyhow, that’s my $0.02…. Cheers!